EP0032893B1 - Apparatus with expandable tube bundle - Google Patents

Apparatus with expandable tube bundle Download PDF

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Publication number
EP0032893B1
EP0032893B1 EP19790901438 EP79901438A EP0032893B1 EP 0032893 B1 EP0032893 B1 EP 0032893B1 EP 19790901438 EP19790901438 EP 19790901438 EP 79901438 A EP79901438 A EP 79901438A EP 0032893 B1 EP0032893 B1 EP 0032893B1
Authority
EP
European Patent Office
Prior art keywords
bundle
length
tubular elements
tubes
spacers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19790901438
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0032893A1 (en
EP0032893A4 (en
Inventor
Charles Frederick Reitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP0032893A1 publication Critical patent/EP0032893A1/en
Publication of EP0032893A4 publication Critical patent/EP0032893A4/en
Application granted granted Critical
Publication of EP0032893B1 publication Critical patent/EP0032893B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/02—Hollow fibre modules
    • B01D63/027—Twinned or braided type modules
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • F28F21/062—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing tubular conduits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/14—Specific spacers

Definitions

  • This invention relates to a heat exchanger having hollow, flexible tubular units for fluids to pass through and a housing or shell surrounding the tubular units so that one fluid can be passed through the apparatus between the shell and the tubular units and another fluid can be passed through the tubular units with the flexible tubes in a twist configuration with respect to the individual tubes from one end to the other end.
  • Heat exchanger apparatuses with flexible tubes usually possess tapes and screen baffles to keep the flexible tubes from rubbing against the housing around said tubes and to effect a suitable heat transfer rate.
  • Said tapes and baffle also tend to filter out dirt in sedimentary deposits that is very difficult and in some cases impossible to remove.
  • Such flexible tube heat exchangers do not attain maximum heat transfer due to the tendency of the flexible tubes to remain parallel to each other thereby permitting the tubes to occupy less than all of the available volume within the housing of said heat exchanger. This provides a bypass route for the fluid passing through the shell side of the exchanger.
  • the shell side of the tubular elements tend to build up or cake with solid material from the fluid, e.g., river water, used as the heat exchange medium, thereby decreasing the heat exchange efficiency and interfering with the flow patterns in the exchanger.
  • Most exchangers therefore have to be shut down frequently to remove the solid material before the efficiency of the heat exchanger falls below some desired minimum.
  • the same buildup can occur when the shell side of the tubular elements contains a fluid containing material which can be separated out as a solid during its presence in the heat exchanger.
  • a heat exchanger is known in accordance with the prior art portion of claim 1 (US-A-3,858,646) in which the tubular bundle has a length equal to that of the housing, the tubular elements in each bundle have the same length and only a very low twist and the spacers merely surround some of the tubular elements and occupy only a small part of the internal diameter of the housing.
  • a heat exchanger of this type there is a tendency to build-up of solid particles contained in one of the heat transfer fluids.
  • the invention as claimed in claim 1 solves the problem of how to design a heat exchanger with which build-up of sediment between the tubes is avoided, even if, e.g., brackish water is used as a heat transfer medium.
  • the advantages offered by the invention are mainly that the tubular elements are capable of flexing and moving and cannot lie parallel to one another, thereby reducing build-up of solid particles thereon.
  • brackish water may be used as a heat transfer medium without problems in build-up of sediment between the tubes.
  • the spacers are used to effect more efficient flow patterns than when the tubes are held by conventional spacers and tapes.
  • the absence of tape welds makes it possible to use thin walled tubes to attain maximum heat transfer rates in heat exchangers and more efficient ion transfer in ion exchangers.
  • the use of spacers instead of tapes also causes a flow pattern of the fluid such that sediment deposits from the fluid tend to be washed through the exchanger.
  • the tubular elements are generally formed of a suitable thermoplastic polymer, preferably of a suitable polyfluorinated plastic material.
  • a suitable thermoplastic polymer preferably of a suitable polyfluorinated plastic material.
  • Particularly adaptable are polymers and copolymers of tetrafluoroethylene sold under the trade name Teflon@) by E. I. du Pont de Nemours and Company and polypropylene.
  • Representative examples of such polyfluorinated thermoplastic polymers include polytetrafluoroethylene modified with polyhexafluoropropylene, copolymers of tetrafluoroethylene and per- fluoropropylvinyl ether, tetrafluoroethylene, ethylene. and hexafluoroacetone (Tefzel0 manufactured by E. I.
  • du Pont de Nemours and Company Du Pont de Nemours and Company
  • fluorinated ion exchange polymers may be used without departing from the spirit of the invention.
  • Any organic polymeric compositions that are thermoplastic, possess suitable compatability with the fluids handled, possess adequate properties such as strength at the desired operating conditions and further possess adequate thermal conductivity for the desired use may also be used.
  • Representative organic polymeric compositions also include polymers of aliphatic olefins, e.g., homopolymers and copolymers of ethylene, propylene, butene-1, pentene-1, hexene-1, octene-1, decene-1, butadiene, styrene; polymers of vinyl halides, e.g., vinyl chloride, vinyl fluoride, vinylidene fluoride; polymers of amides, e.g., hexamethylene adipamide, hexamethylene, sebacamide, caprolactam, etc.; polyacetals, e.g., polyoxymethylene, formaldehyde copolymers; polyaromatic ethers, e.g., polyphenylene oxide; polyurethanes; polyesters, e.g., polycarbonates, polyacrylates, polyalkylene dicarboxylates; chlorinated polyethers, etc.
  • the fluorinated ion exchange polymers possess pendant side chains containing sulfonyl groups attached to carbon atoms having at least one fluorine atom connected thereto.
  • the fluorinated ion exchange polymers are prepared from monomers which are fluorinated or fluorine substituted vinyl compounds.
  • the polymers are made from at least two monomers with at least one of the monomers coming from each of the two groups described below.
  • the first group is fluorinated vinyl compounds such as vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene chlorotrifluoroethylene, perfluoro(alkyl vinyl ether), tetrafluoroethylene and mixtures thereof.
  • the second group is the sulfonyl-containing monomers containing the precursor ⁇ SO 2 F or -S0 2 CI.
  • CF 2 CFSO zF .
  • Additional examples can be represented by the general formula CF 2 ⁇ CFR,SO 2 F wherein R, is a bifunctional perfluorinated radical comprising 2-8 carbon atoms.
  • R is a bifunctional perfluorinated radical comprising 2-8 carbon atoms.
  • the particular chemical content or structure of the radical linking the sulfonyl group to the copolymer chain is not critical but such must have a fluorine atom attached to the carbon atoms to which is attached the sulfonyl group.
  • sulfonyl fluoride containing comonomers are examples of such sulfonyl fluoride containing comonomers.
  • the most preferred sulfonyl fluoride containing comonomer is perfluoro(3,6-dioxa-4-methyl-7- octenesulfonyl fluoride),
  • the tube bundles of the apparatus of this invention are prepared from tubes being of various lengths that range from 8,3 to 83,3 mm per meter (0.1-1.0 inch per foot) of bundle length.
  • These tube bundles can conveniently be prepared by the use of a trough having a bend that is generally at least 5°, preferably 10-15°, of any desired length, into which tubular elements are laid. Due to this bend in the trough, the tubes laid therein will vary in length from the adjacent tubes.
  • the tubes are then cut to conform to the desired length of the bundles by a vertical cutting of both ends of the tubes.
  • the tube ends are then sealed together with heat after the desired number and type of spacers have been placed in the trough so that the tubular elements pass through the holes in the spacer as desired.
  • Spacers are used to help keep the tubular elements from nesting by more evenly distributing the tubular elements within the housing walls.
  • the spacers are placed 15 to 75 cm apart. This depends on the particular system being used.
  • the design of the spacer so that up to 80% of the area is made up of holes for the tubular elements to pass through is unique and causes the flow of fluid to avoid parallel flow by arranging the opening that amounts to 20% of the area of the spacer to be turned at least 45° from the adjacent spacer.
  • the remaining area of 20% or more of the spacer is one opening through which from 1-100 tubular elements can pass.
  • the passage of some fluid through the spacer holes between the circumference of the holes and the outer surface of the tubular elements permits minimal parallel flow of the fluid, but results in a reduction in the wear of the tubular elements.
  • the turning of the spacers with respect to the adjacent spacer can be from 45-315°, however, they are preferably turned from 90-270°, and most preferably 180° from the adjacent spacer to prevent parallel flow of the fluid on the shell side of the exchanger.
  • This arrangement of the spacers directs the majority flow of fluid on the shell side of the tubular elements through the open sections thereby creating a cross flow that improves the heat transfer rate across the tubes.
  • Some fluid passes around the tubes between the tubes and the hole through which they pass but the majority passes through the open sections that are at least 45° turned from the previous spacer thereby preventing channeling.
  • the majority flow is a cross flow with some parallel flow occurring around the tubes in the holes.
  • the spacers of this invention are generally circular in shape and sized to fit tightly against the inside circumference of the housing in such a manner that the fluid in the shell side of the exchanger will only minimally flow around the spacers.
  • the tubes are pulled from creel, straightened and threaded through the spacers.
  • One end of the tubes is fused together and to a connector ring that surrounds the fused tubes.
  • the tubes are then bowed by laying them in a trough with a bend (angle of bend disclosed herein) with the spacers in place and the second end of the tubes is fused together and to a connector ring that surrounds the fused tubes.
  • the fusing of the tubular elements at the ends can be performed one one end before subjecting them to the desired bend followed by twisting and fusing the other end or both ends may be fused after they have been subjected to the desired bend and twist. Both ends may be fused before any twist. In this case, the tube bundle is twisted when the ends are anchored to the housing means.
  • the spacers are anchored in the desired position by the use of a rod running the length of the tube bundle through each spacer at its outer edge and fused to the other tubes and to a sheath or header ring as a tubular element is.
  • the rod is generally of plastic material (e.g., Teflon@).
  • Teflon@ The polymeric materials described above may also be used to make said rods.
  • the ends of the rods are sealed with the honeycomb of tubular elements to anchor the rods at both ends.
  • the rod size is generally of the same outside diameter as the tubes. However, larger outside diameter rods can also be used.
  • the apparatus of this invention results in three improvements over conventional apparatuses. These are (1) reduced buildup of sediment on the shell side of the tubes, (2) reduced tube leaks (due to absence of tapes), (3) increased overall heat transfer due to lower velocity of fluids on the shell side without sedimentary deposits and reduced nesting of the tubes.
  • the three critical requirements in achieving the above improvements are the variation in length of the tubes, the twist set of the tubes, the spacers and bowed tubes.
  • the bowed tubes are attained with the use of an excessive tube bundle length for the housing so that the tube ends must be pushed in toward each end of the housing before the bundles are locked to the housing in fluid tight arrangement.
  • the terminal portions of the bundle of tubular elements are sealed in an arrangement within an annular member that cooperates with the lateral dimension securing means.
  • the lateral dimension securing means and the means for attaching said securing means to the housing are known in the art. Any conventional means for accomplishing this may be used.
  • a conventional flexible tube apparatus is an apparatus known in the art as heat exchanger which has flexible, relatively small diameter, thin walled, hollow, polymeric tubular elements.
  • the preferred tube sizes of this invention are from 3,175 mm O.D. to 7,75 mm O.D.
  • the apparatus of this invention may be used to exchange heat between two fluids.
  • the fluids e.g., may be sulfuric acid of different strengths and different temperatures.
  • a process might involve liquids inside the tubes and gas on the shell side, e.g., sulfur dioxide gas on the shell side and water in the tubes.
  • the apparatuses of this invention are most often utilized to exchange heat from one fluid to another fluid where corrosiveness of one fluid or both is a factor to be considered.
  • the cleaner fluid being used be the fluid inside the tubes and the one not as clean be the fluid outside the tubes.
  • the flow of heat from the shell side of the tubes into the tubes or from the inside of the tubes toward the shell side also tends to cause the tubes to bow.
  • the apparatus of this invention when the tubular elements are fabricated from fluorinated ion exchange polymers with sulfonyl groups may be used to separate metals from plating solutions with reduced build up of sediment on the shell side of the tubular elements from the plating solutions.
  • the housing means may be fabricated from steel or other metals and it may be uncoated or coated or lined with a polymeric material where corrosiveness is a factor.
  • the polymer used for this coating may be selected from the polymers described herein but is not intended to be limited to said polymers.
  • coating or lining may be of polymers that are not thermoplastic.
  • spacer 2 is shown with holes 10 through which a plurality of tubular elements pass making up as much as 80% of the area of the spacer.
  • An opening 11 that amounts to 20% or more of the surface area of the spacer is provided for a plurality of tubular elements.
  • An identical spacer 3 is shown rotated 180° with respect to identical spacers 2.
  • rods 7 and 8 are fused into the honeycombed ends 6 of the tubular elements in the same manner as an individual tubular element.
  • Rod 7 extends through holes on spacers 2, 3, 4 and 5 and tie into the other terminal portion of the tubular elements in the same manner as an individual tubular element.
  • Rod 8 also extends through the spacers and is fused to both ends of the bundle but is located about 90° from rod 7.
  • Two other rods spaced 90° apart and 90° from other rods make up a total of four rods which anchor the spacers.
  • the spacers are located at intervals defined herein between the terminal portions of the tube bundle shown and are each rotated 180° with respect to the adjacent spacer.
  • the tube bundle and rods are enclosed within a housing means.
  • the tubular elements of the bundle are in a twist configuration which, for purposes of illustration, are intended to amount to 360°.
  • the plurality of tubular elements making up the bundle 1 are sealed together at both ends so that the individual tubes are parallel to each other and packed together with a minimum of space between them to form a "honeycomb" effect 6.
  • a sheath or header ring 9 made up of polymer that can be the same as that of the tubular elements is bonded by fusing the sheath around the honeycomb at tubes. The finished bond leaves no passageway between the tube walls and sheath or between the tube walls themselves.
  • An apparatus with the features of the present invention was prepared with tubes of 6,35 mm O.D. of a copolymer of tetrafluoroethylene and hexafluoropropylene (Teffon0 FEP 160 made by E. I. du Pont de Nemours and Company) that varied in length from 4,88 m to 5,08 mm and arranged in a 10° per 30 cm of bundle length twist and in a housing such that there will be a 2% excess in length of the tubes.
  • the spacers were 45,7 cm apart with holes large enough for 80 tubes per each hole.
  • Raw river water from the James River at Richmond, Virginia was fed to the shell side of the apparatus and steam was fed to the inside of the tubes and data taken to calculate the overall heat transfer coefficient Uo. The following data represent average data from four runs:
  • Example 1 The procedure of Example 1 was followed except that a conventional apparatus with 6,4 mm O.D. of the same Teflon@ FEP 160 tubes 3,35 m in length with welded tapes was used. The raw river water and steam flows were essentially parallel and gave the following overall heat transfer coefficient in a series of 3 runs:
  • Comparative Example A The apparatus of Comparative Example A was placed in commercial operations with steam and water at the same commercial facility with the same river water. After six months of operation, the shell side was plugged solid with silt.
  • the apparatus was connected so that a slurry of sand in water could be recirculated through the shell side of said heat exchanger. After 16 hours of recirculating of the sand slurry, the exchanger had 28 kg of sand deposited therein. After six flow interruptions, 13 kg of that amount of sand were freed.
  • Comparative Example C The procedure of Comparative Example C was followed except the apparatus was one constructed according to the disclosure in the present application of the same size, number of tubes, diameter and length as in Comparative Example C.
  • One end of the tube bundle was honeycombed (tubes fused to each other and to a collector ring surrounding the honeycomb).
  • the tubes were slipped through three spacers spaced approximately 46 cm apart, said spacers containing six circular holes in an area making up less than 80% of the cross sectional area of the spacer and one opening making up at least 20% of the cross sectional area.
  • the spacers were rotated 180° from the adjacent spacer.
  • the tube bundle was bent 8° in a trough having a 66 cm radius.
  • the other end of the tubes in the bundle was honeycombed while the tube bundle was in this configuration.
  • the longest tube was three inches longer than the shortest tube and the tube bundle length was 7,6 cm longer than the shell.
  • the tube bundle was pulled through the shell and compressed and twisted 15° per 30 cm of tube bundle length to fit the shell and locked into place.
  • 725 kg of the sand were deposited in the apparatus.
  • One interruption of the recirculation freed 4,53 kg of sand.
  • 1,8 kg of additional sand were freed.
  • Tests were conducted with an apparatus of the present invention and another apparatus of the same size except that the spacers of the present invention were not used.
  • the apparatuses were compared in a vertical position and in a horizontal position.
  • the apparatus of this invention comprised a shell 15,2 cm in diameter and 1,8 m long.
  • a tube bundle containing 106 tubes of 6,3 mm O.D. with a wall thickness of 0,6 mm inch was honeycombed at one end.
  • the tubes were slipped through three spacers and the bundle was then laid in a trough with a bend such that the tube lengths varied 10 cm from the shortest to the longest.
  • the tube bundle was twisted 20° per 30 cm of tube bundle length and the other end was honeycombed.
  • the tube bundle length was one inch longer than the shell.
  • the spacers included holes 2,2 cm in diameter in a triangular arrangement over an area amounting to 80% of the area of the spacer and over the area covering 20% of the area of the spacer was a single noncircular opening.
  • Hot water was circulated inside the tubes and cold water on the shell side and then this arrangement was reversed.
  • An overall heat transfer was calculated from data obtained with the apparatus in a vertical position and a horizontal position. The data obtained is summarized below:
  • Example 3 The apparatus of Example 3 was made except that no spacers were used and the apparatus tested as in Example 3. The following data was obtained:
  • Example 3 The apparatus of Example 3 was made except that the twist was 5° per 30 cm of tube bundle and no spacers were used and the procedure of Example 3 was followed. The following data was obtained:
  • Example 1 represents the best mode of operation.
  • the apparatus of the present invention can be used where fluid heat exchange is required and more especially where these fluids are corrosive in nature.
  • the apparatus of the present invention can also be used in applications where ion exchange or removal of ions from streams is required when the tubular units are fabricated from ion exchange material.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP19790901438 1979-07-11 1981-02-09 Apparatus with expandable tube bundle Expired EP0032893B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1979/000485 WO1981000297A1 (en) 1979-07-11 1979-07-11 Apparatus with expandable tube bundle

Publications (3)

Publication Number Publication Date
EP0032893A1 EP0032893A1 (en) 1981-08-05
EP0032893A4 EP0032893A4 (en) 1981-11-25
EP0032893B1 true EP0032893B1 (en) 1984-03-21

Family

ID=22147630

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790901438 Expired EP0032893B1 (en) 1979-07-11 1981-02-09 Apparatus with expandable tube bundle

Country Status (5)

Country Link
EP (1) EP0032893B1 (enrdf_load_stackoverflow)
JP (1) JPS56500864A (enrdf_load_stackoverflow)
BR (1) BR7909021A (enrdf_load_stackoverflow)
DE (1) DE2966828D1 (enrdf_load_stackoverflow)
WO (1) WO1981000297A1 (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1259870A (en) * 1984-10-01 1989-09-26 Eiichi Hamada Heat exchanger and blood oxygenating device furnished therewith
DE3583038D1 (de) * 1985-11-11 1991-07-04 Senko Med Instr Mfg Blutoxygenator.
GB8811813D0 (en) * 1988-05-19 1988-06-22 York Int Ltd Heat exchanger
FR2793010B1 (fr) * 1999-04-29 2001-07-06 Valeo Thermique Moteur Sa Echangeur de chaleur a tubes souples, en particulier pour vehicule automobile
FR2793011B1 (fr) * 1999-04-29 2001-07-06 Valeo Thermique Moteur Sa Echangeur de chaleur a tubes souples, notamment pour vehicule automobile
US20140175003A1 (en) * 2011-06-30 2014-06-26 Dow Global Technologies Llc Filtration module including hollow fiber supports
DE102019101740B4 (de) * 2019-01-24 2021-08-05 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zur Herstellung eines Mikrokanalbündel-Wärmetauschers

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2644675A (en) * 1949-11-03 1953-07-07 American Locomotive Co Heat exchanger
US3422008A (en) * 1963-10-24 1969-01-14 Dow Chemical Co Wound hollow fiber permeability apparatus and process of making the same
US3228456A (en) * 1965-03-01 1966-01-11 Du Pont Method and apparatus employing hollow polyfluorinated plastic filaments for heat exchange
US3363680A (en) * 1966-07-21 1968-01-16 Du Pont Plastic tube heat exchanger with novel header construction
US3419069A (en) * 1967-04-28 1968-12-31 Du Pont Heat transfer apparatus having flexible plastic tubular elements arranged in a braided configuration
US3438434A (en) * 1967-10-19 1969-04-15 Du Pont Subdivided heat exchanger tube bundle assembly providing longitudinally distributed fluid bypass and distributing channels
US3526274A (en) * 1968-06-04 1970-09-01 Du Pont Cross flow box cooler unit
GB1280453A (en) * 1968-06-24 1972-07-05 Univ Newcastle Heat exchangers
US4026783A (en) * 1973-12-17 1977-05-31 E. I. Du Pont De Nemours And Company Electrolysis cell using cation exchange membranes of improved permselectivity
US3858646A (en) * 1974-05-28 1975-01-07 Harry E Naylor Heat exchanger
JPS526804A (en) * 1975-07-05 1977-01-19 Hitachi Ltd H-shell water heater
CA1092515A (en) * 1976-07-23 1980-12-30 Donald J. Bentley Dialyzer and method of dialysis

Also Published As

Publication number Publication date
EP0032893A1 (en) 1981-08-05
JPS56500864A (enrdf_load_stackoverflow) 1981-06-25
BR7909021A (pt) 1981-05-26
DE2966828D1 (en) 1984-04-26
EP0032893A4 (en) 1981-11-25
WO1981000297A1 (en) 1981-02-05

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